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Data Structures

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Introduction to Arrays

Arrays var vs. let vs. const Challenge: Remove Even Integers From an Array Solution Review: Remove Even Integers From an Array Challenge: Merge Two Sorted Arrays Solution Review: Merge Two Sorted Arrays Challenge: Find Two Numbers that Add up to "value"Solution Review: Find Two Numbers that Add up to "value"Challenge: Array of Products of All Elements Solution Review: Array of Products of All Elements Challenge: Find Minimum Value in Array Solution Review: Find Minimum Value in Array Challenge: Find First Unique Integer in an Array Solution Review: First First Unique Integer in an Array Challenge: Find Second Maximum Value in an Array Solution Review: Find Second Maximum Value in an Array Challenge: Right Rotate an Array by n Solution Review: Right Rotate an Array by n Challenge: Rearrange Positive & Negative Values Solution Review: Rearrange Positive & Negative Values Challenge: Rearrange Sorted Array in Max/Min Form Solution Review: Rearrange Sorted Array in Max/Min Form Challenge: Maximum Sum Subarray Solution Review: Maximum Sum Subarray Arrays Quiz: Test Your Understanding of Arrays

Introduction to Linked Lists

Singly Linked Lists (SLL)Basic Linked List Operations Singly Linked List Insertion Challenge: Insertion at Tail Solution Review: Insertion at Tail Challenge: Search in a Singly Linked List Solution Review: Search in a Singly Linked List Singly Linked List Deletion Challenge: Deletion by Value Solution Review: Deletion by Value Deletion at the Tail Linked Lists vs. Arrays Challenge: Find the Length of a Linked List Solution Review: Find the Length of a Linked List Challenge: Remove Duplicates from Linked List Solution Review: Remove Duplicates from a Linked List Challenge: Union & Intersection of Linked Lists Solution Review: Union and Intersection of Linked Lists Challenge: Return the Nth Node from the End Solution Review: Return the Nth Node from the End Doubly Linked Lists (DLL)Singly Linked Lists vs. Doubly Linked Lists Linked Lists Quiz: Test Your Understanding of Linked Lists

Introduction to Stack/Queues

What is a Stack?Stack (Implementation)What is a Queue?Queue (Implementation)Challenge: Generate Binary Numbers From 1 to n Using Queue Solution Review: Generate Binary Numbers From 1 to n Using Queue Challenge: Implement Two Stacks using One Array Solution Review: Implementing Two Stacks Using One Array Challenge: Reversing First k Elements of Queue Solution Review: Reversing First k Elements of Queue Challenge: Implement a Queue Using Stacks Solution Review: Implement a Queue Using Stacks Challenge: Sort Values in a Stack Solution Review: Sort Values in Stack Challenge: Evaluate Postfix Expression Using a Stack Solution Review: Evaluate Postfix Expression Using a Stack Challenge: Next Greater Element Using a Stack Solution Review: Next Greater Element Using a Stack Challenge: Check Balanced Parentheses Using Stack Solution Review: Check Balanced Parentheses Using Stack Challenge: min() Function Using a Stack Solution Review: min() Function Using a Stack Stack/Queue Quiz: Test Your Understanding of Stack/Queue

Introduction to Graphs

What is a Graph?Types of Graphs Representation of Graphs Graph Implementation Complexities of Graph Operations What is a Bipartite Graph?Graph Traversal Algorithms Challenge: Implement Breadth First Search Solution Review: Implement Breadth First Search Challenge: Implement Depth First Search Solution Review: Implement Depth First Search Challenge: Detect Cycle in Graph Solution Review: Detect Cycle in Graph Challenge: Find a "Mother Vertex" in a Graph Solution Review: Find a "Mother Vertex" in a Graph Challenge: Count the Number of Edges in an Undirected Graph Solution Review: Count the Number of Edges in an Undirected Graph Challenge: Check if a Path Exists Between Two Vertices Solution Review: Check if a Path Exists Between Two Vertices Challenge: Check if an Undirected Graph is Tree or not Solution Review: Check if an Undirected Graph is Tree or not Challenge: Find the Shortest Path Between Two Vertices Solution Review: Find the Shortest Path Between Two Vertices Challenge: Remove Edge Solution Review: Remove Edge Graph Quiz: Test Your Understanding of Graphs

Introduction to Trees

An Introduction to Trees and Basic Tree Properties!What is a Binary Tree?What Makes a Tree 'Balanced'?More on Complete Binary Trees Skewed Binary Tree What is a Binary Search Tree (BST)?Implementing a Binary Search Tree in JavaScript Binary Search Tree Insertion Binary Search Tree Insertion (Implementation)Pre-Order Traversal In-Order Traversal Post-Order Traversal Searching in a Binary Search Tree (Implementation)Deletion in Binary Search Tree Deletion in Binary Search Tree (Implementation)What is an AVL Tree?AVL Insertion AVL Deletion What is a Red-Black Tree?Red-Black Tree Insertion Red-Black Tree Deletion What is a 2-3 Tree?2-3 Insertion 2-3 Deletion (Case #1)2-3 Deletion (Case #2)2-3-4 Trees Overview of Trees Challenge: Find the Minimum Value in a Binary Search Tree Solution Review: Find the Minimum Value in Binary Search Tree Challenge: Find the kth Maximum Value in a Binary Search Tree Solution Review: Find kth Maximum Value in Binary Search Tree Challenge: Find Ancestors of a Given Node in a BST Solution Review: Find Ancestors of a Given Node in a BST Challenge: Find the Height of a BST Solution Review: Find the Height of a BST Challenge: Find Nodes at "k" Distance From the Root Solution Review: Find Nodes at "k" Distance From the Root Trees Quiz: Test Your Understanding of Trees

Trie

What is a Trie?Structure of a Trie Insertion in a Trie Search in a Trie Deletion in a Trie Challenge: Total Number of Words in a Trie Solution Review: Total Number of Words in a Trie Challenge: Find All Words Stored in Trie Solution Review: Find All Words Stored in Trie Challenge: Array Sort Using Tries Solution Review: Array Sort Using Tries Challenge: Word Formation from a Dictionary Using Trie Solution Review: Word Formation from a Dictionary Using a Trie Trie Quiz: Test Your Understanding of Tries

Introduction to Heap

What is a Heap?

Max Heap: Introduction

Max Heap (Implementation)

Min Heap: Introduction

Min Heap (Implementation)

Challenge: Convert Max-Heap to Min-Heap

Solution Review: Convert Max-Heap to Min-Heap

Challenge: Find k Smallest Elements in an Array

Solution Review: Find k Smallest Elements in an Array

Challenge: Find k Largest Elements in an Array

Solution Review: Find k Largest Elements in an Array

Heap Quiz: Test Your Understanding of Heaps

Introduction to Hashing

What is a Hash Table?The Hash Function Collisions in Hash Tables Building a Hash Table from Scratch Add/Remove & Search in Hash Table (Implementation)A Quick Overview of Hash Tables Trees vs Hash Tables Challenge: An Array as a Subset of Another Array Solution Review: An Array as a Subset of Another Array Challenge: Check if Arrays are Disjointed Solution Review: Check if Arrays are Disjointed Challenge: Find Symmetric Pairs in an Array Solution Review: Find Symmetric Pairs in an Array Challenge: Trace the Complete Path of a Journey Solution Review: Trace the Complete Path of a Journey Challenge: Find Two Pairs in an Array Such That a+b = c+d Solution Review: Find Two Pairs Such That a+b = c+d Challenge: A Subarray with a Sum of 0 Solution Review: A Subarray with a Sum of 0 Challenge: Find Two Numbers that Add up to "value"Solution Review: Find Two Numbers that Add up to "value"Challenge: Find First Unique Integer in an Array Solution Review: Find First Unique Integer in an Array Challenge: Remove Duplicates from a Linked List Solution Review: Remove Duplicates from a Linked List Challenge: Union of Linked Lists Solution Review: Union & Intersection of Linked Lists Hashing Quiz: Test Your Understanding of Hashing

Conclusion

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Heap Quiz: Test Your Understanding of Heaps

Heap Quiz: Test Your Understanding of Heaps

Here are the top ten most commonly asked interview questions on heaps!

Technical Quiz

1.

Choose the correct option:

A.

Stack is used to implement heap.

B.

A valid heap must be a complete binary tree.

C.

Both A and B

D.

None of the above

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